Motor-controlling device.



G. E. CARPENTER. MOTOR CONTROLLING DEVICE.

urmoumn FILED MAY 9, 1907.

910,042. Patented Jan. 19, 1 09.

2 SHEETS-SHEET 1.

ii 22653-25" M 53 F4 /-uf,9

ATTORNEY G. E. CARPENTER. MOTOR CONTROLLING DEVICE.

APPLICATION FILED MAY 9, 1901.

910,042. I Patented Jan. 19; 1909.

z snnn'rs-snnm 2.

WITNESSES:

, uurrnn STATES. rnrnr onrron.

CHARLES E.

CARPENTER, OF NEW YORK, N. Y., ASSIGNOR TO THE OUTLER-HAJSMER MFG.

00., OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

moron-con'rnontrne nnvrcn.

Specification of Letters Patent.

Patented J's-n. 19, 1909.

To all whom it may concern:

Be it known that I, CHAnLns E. CARPEN- TER, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented new and useful Improvements in Motor-Controlling Devices, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification. l

My invention relates to improvements in controlling devices for electric motors.

One ofthe objects of my invention is to provide a device for starting the motor, which will permit the motor to start with all the armature resistanceiincircuit and after the motorv has attained a predetermined speed, cut out'the armature resistance, and at the same time include, in operative relation, means for controlling the speed of the motor through a field resistance. T

Another object ofmy invention is theprovision of means whereby it will be im ossible to start the motor on a weakened eld.

For the purpose of disclosing my invention, I have illustrated in the accompanying drawings one embodiment thereof.

' In said drawings: Figure 1 is an elevation of a controlling device embodying my invention, and Fig. 2 is a diagrammatic view of the circuit arrangement thereof.

In the embodiment of my invention illustrated, I provide a suitable base or panel 2, which maybe formed of slate or some like insulating material, upon which the various parts of the controlling device are mounted. The motor circuit is controlled by a snap switch 3 mounted on the face of the panel 2, and having a suitable operating. handle 4. The field resistance of the motor 1s controlled by a movable arm 5 pivoted at 6 upon the face of the base or panel 2, and adapted to engage and sweep over a plurality of contact buttons 7, suitable buffers or stops 8 being arran ed to limit the movement of the arm 5. handle 9 is provided upon the arm for moving the same. A switch which in one position is adapted to short circuit the field controlling means, and in another position is adapted to short circuit the armature resistance, is provided in the form oi. a metallic disk 10, resiliently supported upon a tail rod 11, eaten-din from the core 12 of a solenoid 13. The dis 10 is preferably incontacts 17 and 18 and when raised b core 12, is adapted to engage a pair 0 consulated from the tail rod by an-insulating. bushing 14, and is resiliently supported upon said tail rod by a coiled spring 15 resting upon a collar 16, secured to the end of the tail rod. When in its lowermost position, the disk 10 is adapted to engage a pair plf t e tacts 19 and 20. Extendm from the upper end of the core 12 is a ro 21 on which is mounted a disk contact 22. This contact is loosely mounted upon the rod 21, between the adjustable collars 23 and 24, whereby as the rod is raised, collar 24 will engage the disk 22, and raise the same after the'disk 10 has engaged the contacts.19 and 20. The

disk 22 when in its lowermost position engages the contacts 25 and 26. For making the proper circuit connections, the controlling device is provided with suitable binding posts 27, 28, 29, 30 and 31, and for protecting the device against excessive current, the controller is provided with suitable fuses 32.

In Fig. 2 the circuit arran ement' of the controlling device is more fufiy illustrated.

The snap switch 3 comprises a air of .con-

tact members 33 and 34 suitab y insulated from one another, which are adapted to bridge the contacts 35 and 36, and 37 and 38 respectively. A suitable field resistance 39 is divided in sections and connected with the contact buttons 7. A resistance 40 for thev 47, with the binding post 31, and the 0 p0 site terminal of the field is connecte by conductors 48 and 47, with the binding post nected with the binding ost 30, and the.

negative side 50 of the inc is connected with the binding post 29.

In operation, in order to start the motor, the snap switch 3 is moved to its "011 position, and the switch member 33 will bridge the contacts 37 and 38, while the switch member 34 will bridge the contacts 35 and. 36. This completes the armature circuit from the positive side 49 of the line, by conductcr 51, across the switch member 34:, by

conductors 52, a? and to, through the armature. 42 of the motor, thence by conductors .43 and 53, through the armature resistance ll, by conductors 54c and'ofi, across the switch member 33, and thence by conductor 56 to the negative side 50 of the line,

means, whereby At the same time, the field circuit is established from the conductor d? by conductor d8, through the field winding it, by conductors 455 and 57, across the switch 10, to conductor 54:, and thence back to the negative side of the line as has been previously described with respect to the armature circuit, The motor thus starts with the armature resistance in circut. lit will be noted, however, that the circuit is established in a shunt around the field controlling 3 will start under field 1e winding of the solenoid is connected. across the terminals of the armature hora one terminal thereof, lay-conductors d3 53, through the winding of the solenoid 13, across the switch 22, by conductors 58, 4:7 and 4:6 to the opposite terminal oithe armature. When the speed of the motor has reached about 65% of normal, the counter electro-motive force set up by the armature, will energize the/solenoid 13' suficiently for the solenoid to raise its core, and the switch member 10 will engage the contacts 19 and 20, thereby cutting out the resistance 41 from the armature circuit, and the speed of the motor will increase to normal under full field. The raising of the switch member 10 opens the short circuit around the field resistance and establishes the field circuit from the conductor 47, by conductor 48, through the field it, by conductors 45 and 59, to the first of the contacts 7 thence across the armo, by conductor 55, and across the switch member 33, and by conductor 56 to the ne ative side 50 of the line. This circuit, it Wlll be noted, includes the field resistance controlling device, and

the speed of the motor may be increased by moving the arm 5 across the contact buttons? j to insert the resistance 39 in the field circuit.

At the same time that the core of thej solenoid raises theswitch 10 to brid e the contacts 19 and 20, the switch 22 is raised to insert the resistance 40 in series with the j solenoid 13 to prevent overheating of said solenoid. To stop the motor it isonly nec- 3 to c on the switch 3, when the motor essa circuit wi be opened, and when the armature 42 comes to a stop, the solenoid 13 will be deenergized, permitting the switch operated thereby to drop back to the starting position, It will be noted that when the switches drop back to starting position the field resistance controlling device is again short circuited, whereby when the motor is It will be understood that if desired, the arm 5 may be left in any desired position with any amount of the field resistance. in circuit, without damage, as when the motor starts, it will start with the field resistance short circuited. This permits the setting of the field resistance controlling arm to any position to insure the motor immediately building up to a predetermined speed, without waiting for the motor to attain normal speed with the armature resistance cut out before adjusting the field resistance.

Having thus described my invention what I claim as new and desire to secure by Let ters Patent is:

1.. In a controller for electric motors, the combination with a pair of contacts, of an arms tur resistance connected. thereto, resistance, a controlling member therefor, pair of contacts connected in a shunt circuit around said field resistance, and electromagnetically operated means adapted when in one position to bridge one pair of said contacts and in another position to bridge the other of said pairs of contacts.

2. In a controller for electric motors, the combination with a pair-of contacts, of an armature resistance connected thereto, a field regulating resistance,a controlling member therefor, a pair of contacts connected in a shunt circuit around said field resistance, a switch adapted when in one position to Mid e one of said airs of contacts and in anot or position to ridge the other of said pairs of contacts, nd an electromagnetic winding for operating said switch.

3. In a controller for electric motors, the

field regulating resistance, a controlling member therefor, a pair of contacts connected in a shunt circuit around said field resistance, an electromagnetic adapted to be connected across the motor armature, a plunger mounted within said winding, a switch carried by said plunger, said switch being adapted when in one position to bridge one of said pairs of contacts and in another position to bridge the other of said pairs of contacts, and means for inserting a resistance in series with said electromagnetic winding after said switch has been actuated.

In witness whereof, I have hereunto subname in the presence or two witscribed my nesses.

CHARLES E. onarnn'raa. Witnesses A. J. Hon'ro1-r, ROBERT Lnwrs Aims.

started it will not start with a weakened field.

winding combination with a pair of contacts, of an armature resistance connected thereto, a 

